Data change listener

Data Service
1

Hi guys,please tell me the ways which I can use to notify the mobile app(android),that data on server was changed?

2

Hi!

You can use event handlers. Here are links to documentation and video tutorials.
Regards,
Kate.

3

Hi Katya,I have read that

But there is some points
At first how can I send push notification from java code?

4

You can use Backendless Android SDK (it was built in CodeRunner SDK).

Please follow the next documentation.

5

Also you can get information from Backendless Blog: https://backendless.com/what-is-backend-as-a-service/backendless-push-notifications/

Regards,
Kate.

6

Hi Katya,I am trying to implement as you (and documentation) suggest.

But I am little but confused,first of all what appId and key I must to put in my java code.
I tried with android secret key,but I am getting this error (from CodeRunner)

SEVERE: Version is disabled or provided wrong application info (application id o 
r secret key) 



java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.backendless.coderunner.runtime.task.EventInvocationTask.runImpl(E
ventInvocationTask.java:97)
at com.backendless.coderunner.runtime.concurrent.ExtendedRunnable.run(Ex
tendedRunnable.java:22)
at java.lang.Thread.run(Unknown Source)
Caused by: BackendlessException{ code: '2002', message: 'Version is disabled or
provided wrong application info (application id or secret key)' }
at com.backendless.Invoker$SyncResponder.errorHandler(Invoker.java:127)
........

Also I am sending you my code,it was taken from docs.Thanks

Capture.JPG
Capture.JPG1238×545 71.1 KB

7

If you run invocation from CodeRunner (inside business logic) you should use Code Runner Secret Key (Manage -> App Settings -> Secret Keys -> Code Runner Secret Key).
And please look at Bootstrap.java file: init application method was already added in this file with correct parameters.

8

Just for clarification,you want to say that there is no need to init app in handler?And app has already initialized?

9

Also one question too :))

Do I need to set up Android Push Notification google key,if I am going to send push notifications only from server?

10

Hi Vardan,

the init app call is already done for you in Bootstrap.java - it is a file added to your project by code generator.

As for setting up the push notification google key, yes, it is still necessary.

Regards,
Mark